Telerik blogs

With the Q3 2013 release the weather in Telerik’s ASP.NET AJAX suite became a bit cloudy, but the new Cloud Upload control makes the chance of file uploads in Azure, Amazon S3 and Telerik Everlive 100% positive. Try it out—get the new trial product version here or the licensed version from your account and have fun.

Supported providers 

We know how important it is for the RAD (rapid application development) to use components which don’t require tons of custom code in order to work with well-known third-party libraries. Two cloud storages frequently used by our clients are Azure and Amazon S3, so we built RadCloudUpload to support them out of the box.

Today marks the official release of Telerik’s own backend-as-a-service solution, Everlive. We hope that it will quickly become the preferred BaaS, especially for Telerik customers, so RadCloudUpload supports it out of the box as well.

Configuration bliss

To upload files you need to setup the control. The easiest way to do it is to use its smart tag. Choose a provider type and then open the configuration wizard. Here are the mandatory settings that should be set for each provider:

Keep in mind that you should add a reference to the corresponding provider (e.g. Microsoft.WindowsAzure.StorageClient.dll) to your project.
Here you can find detailed information about this. Also the Telerik.Web.UI.WebResource.axd handler should be registered in the web.config. In case that you forget some of the above configurations, the control will kindly remind you with a yellow screen of death.

How does the upload happen?

Under IE9, IE8 andIE7 the control uploads files by submitting “input type=’file‘ ”  element in a separate form to the control’s upload handler. After that the file is transferred to the storage. In the rest of the browsers the files are uploading on chunks to RadCloudUpload’s handler and after the last chunk is sent the file is assembled in the storage.

What’s great is that no files are kept on the hard drive of the server (even temporary), they are only transferred by the handler to the storage.

Other capabilities of Telerik’s ASP.NET Cloud Upload

We have experience with upload controls and we included the features we know are most valuable for our customers in the Cloud Upload, too.

Short Q&A

Q: What happens with the uploaded chunks, if the upload fails?
A: The control triggers a method from the application’s cache after a certain time to delete the chunks.

Q: What will happen with the uploaded files, if they are not processed after a postback (e.g. a user has an account and uploads images, but closes the browser without submitting the page)?
A: The answer here is similar to the previous one. The control triggers a method from the application’s cache after a certain time to delete the files if they are not processed after a postback.
(If you have experience with Telerik’s ASP.NET file upload control this will sound familiar to you)

Q: Are my configuration keys secured?
A: Yes, they are. All the configuration settings are kept in the web.config file.

Q: Why do I need to use a handler to double my traffic, if I am using a modern browser where CORS is available?
A: Because we need to support the old browsers. But keep calm because this is a feature that is in RadCloudUpload’s roadmap for the next releases.

Q: What is coming next?
A: Drag and Drop support.

Feedback please

Have feedback to share? Comment below or write in our Feedback portal and we will be happy to make your development easier.

About the Author

Peter Filipov

is a software developer at one of Telerik's ASP.NET AJAX teams, where he is mainly responsible for RadAsyncUpload, RadProgressArea, RadOrgChart, RadPersistenceFramework and RadDropDownTree. He improves his creativity by trying to keep the above components one step ahead of the competition. Peter is passionate at demo presentations and every single detail of his work. In his spare time he is trying not only to improve his mental abilities but also his physical with yoga and volleyball.

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